Mobile IP Home Agent Handoff via Idle State Detection
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Solution Overview
Problem
Forced home agent handoff in Mobile-IP communication can disrupt data communication and lead to inefficient resource usage by tearing down unnecessary data links, and routing issues may occur due to incorrect tunnel inner addresses during handoff processes.
Innovation Solution
The target foreign agent waits for the mobile node to become idle before initiating a home agent handoff, maintains the data link with the mobile node, and assigns a new tunnel inner address different from the old home address to ensure proper routing during the handoff process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the target foreign agent immediately initiates home agent handoff after detecting the mobile node, then the home agent handoff is performed quickly, but data communication is disrupted and routing issues occur
Solution Approach 1:
The target foreign agent waits for the mobile node to become idle before initiating home agent handoff. This preliminary waiting period ensures that no active data communication is disrupting the handoff process, thereby maintaining communication reliability while still achieving timely handoff when the node is ready.
Solution Approach 2:
The system continuously monitors the mobile node's communication state to determine when it becomes idle. This feedback mechanism allows the target foreign agent to make an informed decision about the optimal timing for handoff, balancing speed and reliability by acting only when the node is ready.
2Reliability
If the target foreign agent tears down the data link during handoff, then routing issues are resolved, but unnecessary resource wastage occurs
Solution Approach 1:
The invention extracts the problematic tunnel inner address configuration from the handoff process. Instead of tearing down the entire data link, the system identifies and corrects only the specific routing issue by assigning a new tunnel inner address, thereby maintaining the data link and avoiding unnecessary resource wastage.
Solution Approach 2:
The system applies local changes to the data link configuration by assigning a new tunnel inner address specific to the handoff scenario. This localized modification resolves the routing issue without affecting the overall data link integrity, avoiding the need to tear down and reestablish the entire connection.
3Ease of manufacture
If the mobile node uses the old home address as tunnel inner address during handoff, then the handoff process is simple, but routing responses become incorrect
Solution Approach 1:
The system changes the tunnel inner address parameter from the old home address to a new address during the handoff process. This parameter change ensures that routing responses are correctly directed to the new location, resolving the routing information accuracy issue while maintaining a relatively simple handoff procedure.
Data Source
AI summary
When a mobile node hands off to a new network access server/foreign agent (NAS/FA) and establishes a data link layer connection with the new NAS/FA, the NAS/FA will determine whether the mobile node is registered with a preferred home agent. If not, the NAS/FA will force the mobile node to hand off to the preferred home agent, while maintaining the data link layer connection with the mobile node.